[jump-oss]

Summary

Fixes #1955.

Fix six existing TOML serialization issues, following up on #1956:

• Omit fields whose values are null, including nullable schema and array-of-tables fields, as discussed in Fix TOML key and table header escaping #1956.
• Reject null field names and null elements in Java arrays or collections at any nesting depth with IllegalArgumentException. Error messages include the field path and element index where applicable.
• Write ordinary assignments before table and array-of-tables headers at each schema level, so fields remain in their intended table.
• Handle Java arrays and collections consistently: serialize all-Schema containers as arrays of tables and reject containers mixing Schema with ordinary values. Mixed ordinary scalar types remain supported.
• Serialize non-finite Float and Double values as nan, inf, and -inf.
• Serialize nested arrays and collections recursively instead of converting them to strings. Schema values inside nested arrays use inline tables.

Literal "null" strings, empty strings, and empty containers remain valid. Non-null schemas whose fields are all omitted retain their empty table structure, including their positions in arrays of tables.

Field suppliers are evaluated once per unique field at each schema occurrence. Relative order is preserved within ordinary assignments and within table fields.

Tests

Added regression tests using a test-scoped TOML parser to verify parsed structure, value types, element counts and order, null handling, and supplier invocation counts.

Verified locally with Java 17:

• .\mvnw.cmd -B "-Dtest=TomlTest,TomlSerializationTest" test -PnoGpg — 378 tests passed.
• .\mvnw.cmd -B clean test -PnoGpg — 21,856 tests passed, with no failures, errors, or skipped tests.
• git diff --check — passed.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.50%. Comparing base (e153529) to head (b809a5e).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1965      +/-   ##
============================================
+ Coverage     92.43%   92.50%   +0.07%     
- Complexity     3584     3602      +18     
============================================
  Files           348      348              
  Lines          7084     7116      +32     
  Branches        695      711      +16     
============================================
+ Hits           6548     6583      +35     
+ Misses          370      369       -1     
+ Partials        166      164       -2     

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